Need to make 519 copies a day

EP5000 is a analog machine not a printer it has no computer interface

"Was it capable doing that type of work?" - "Yes"
"Is it now?" - It depends entirely on the company that is selling it, and how thorough the machine was refurbished. If this is simply a used machine, bought at an auction, or clearance, you won't be happy. If it is supposedly refurbished, then you're still taking chances if you aren't familiar with the company you're buying from. All machines require maintenance items (consumables) on a regular schedule, and if I am selling a machine, all of these "consumables' are replaced prior to the sale, and I always include a lengthy warranty/service contract. I know far to many people that simply spruce the machine up and do the minimum to make the machine make a nice copy, then take the money and run. Let's say you find a "great deal" on a machine for $1500, and a couple of months later it's determined that the machine requires a full maintenance to be performed. You could easily spend $800 - $1000 on that machine, and you can count on several extra "incidental" service calls due to the lack of service done prior to the sale. So was it still a deal? With the amount of copying you're doing, I recommend a refurbished machine, from a reliable source, with a warranty, and/or (all-inclusive) maintenance contract. Pay a little more for the reliability. Remember that the purchase price on a refurbished machine will be a fraction of the operational costs over several years (based on your volume)- for no other reason than "all machines have a set cost per page" - so look at your long term reliability, because those service costs could be really high, depending on the source.
I hope this helps.