Do not have the box and cant find my serial code number and need it in order to return it

That's an older YORK product. The serial numbers are all coded by the alphabet. York or Luxaire parts house can help you. Probably about a 1980's unit. Hope this helps!

SeaTools Test Codes
When SeaTools for Windows determines that a drive has failed a va
lid warranty test, it will display this File Info icon:
Selecting this icon will display a box with three tabs of information about the failure - hints, warranty checking with a SeaTools Test Code
and the log file with test results. This is a typical example:
SeaTools Test Codes are based on the type of test that failed and the product serial number. No two codes are the same. The online RMA submission system will use the SeaTools Test C code number to help process the exchange of your product. The code tells Seagate that
the drive is, in fact, bad and that there is virtually no chance that a good drive is being returned.
When you submit a drive for return to Seagate through the online Warranty and Returns process, the form will ask for your Serial Number, Model Number and SeaTools Test Code. External USB products like FreeAgent and OneTouch do not have ST model numbers. Instead, they have Part Numbers printed on the
plastic case enclosure. You will need to use that part number when
returning a USB drive

on the box also there should be a number on the back of the unit.

if you still have orig box, check labels... otherwise try taking back off, look under the battery

The serial number isn't on the box unfortunately... but it should be on your sales receipt. That rectangle hole that is cut in your xbox's box is the way to see the xbox system's serial number through the box but they don't print it on the box itself. When you buy an XBox 360, the salesperson scans the barcode from the back of the XBox which contains the serial number.

You can check all this in your amazon account and you can return goods once there not opened and returned within 30 days.

If an audio unit with theft protection is disconnected from electrical power, you must enter a unique code number into the unit or it will not work. This code and the audio unit’s serial number are listed on the anti-theft ID card that comes with the vehicle. If this card is lost, you must obtain the audio unit serial number in order to get the radio code. Some newer vehicles allow you to retrieve the audio unit serial number electronically from the radio (some people say that they find the code on a sticker in the glove compartment, but I wouldn't count on that). Refer to your owner’s manual for the specific procedure (the following usually will work: Turn the radio off. Push the preset 1, preset 6, and power buttons at the same time, then quickly release. The number will come up in two sets)
Once you have the audio unit serial number, you can call Auto Customer Service at (800) 999-1009 or have the dealer look up the radio code.
Hope this helps you.

Mitsubishi
Radio unlock procedure

1. Your vehicle requires that you remove the radio from the vehicle in order to retrieve your radio's serial number.
   
   

• SECTION 1.B

Radio serial#

1. Found on top of vehicles radio. You must remove radio from vehicle in order to retrieve radio serial number.
   

• Some vehicles will have A serial# in the glove box. THIS IS NOT THE RADIO SERIAL# AND MAY NOT BE USED IN ANY WAY TO RETRIEVE CODE!
  
• We ask that you not send us this number, as it will only delay your code retrieval process!
  
• The radio serial# is found ONLY on vehicles radio chassis.
  

SECTION 2.B
ALSO


Radio MR or MB#

1. (Found on top of vehicles radio. You must remove radio from vehicle in order to retrieve radio serial number).
   
2. Number will start with MR or MB. You must include all numbers and letters included in serial#, including "MR or MB".
   

The Unlock Code and the device unit's serial number are listed on the anti-theft ID card that comes with the vehicle. The card is usually placed in the glove box at the time of delivery. Use the Unlock Code listed on this card. For certain models, the dealer may have placed a label with the device serial number on the glove box. ----------------- If you cant find it, you need 3 things

1. Vehicle Identification Number (VIN)

2. Phone Number and Zip Code Information

• For security purposes, we(HONDA) verify ownership by comparing the phone number, zip code, and VIN you enter with those we have on file. Unless you have updated these values through Customer Services, the phone number and zip code will be those on file at the time the vehicle was purchased.

3. Device Serial Number

• you need the radio's serial number. since it is located on the back of the radio. your gonna need the pull the radio to get it.

Then CLICK HERE and enter the information for automated code retrieval.