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If the handsets are not currently registered to any base, the SYSTEM RESET menu won't appear.
If the TCX905 handsets in question are actually expansion handsets from another Uniden Phone System, they are not true TCX905 handsets. To verify, remove the battery cover and battery, then look at the inside label. If it lists the model of a TRU9xxx phone system, your handsets are NOT TCX905.
Uniden unfortunately has programmed the expansion handsets from SINGLE LINE TRU9xxx phone systems to NOT REGISTER against the TRU9466. (Those same handsets register fine against predecessor model TRU8866 though).
1. First, remove the battery cover on your unregistered TCX905 and look
under the battery to confirm that you indeed purchased a TCX905 because
some Uniden handsets were packaged as 905's but were not.
2. Take the fully charged unregistered 905 to the base unit TRU9496.
3. On the TRU 9496 base unit press "Menu" then select "Registration" and press OK
4. You should get the message "press the # key on the remote handset".
5. Depress the "#" key on the unregistered 905 and it should register.
Same manual as lethean provided on a similar post but Page 24 if the previously used Base is Unavailable and your phone shows "Deregistration" in the Menu.
Base Unavailable (Handset Only)
To clear the base registration data in the handset, please follow these steps:
Press and hold  and [#] for more than 5 seconds. Select the BASE UNAVAILABLE submenu.
BASE UNAVAILABLE appears. Move the cursor to select YES, and then press the OK soft key.
ARE YOU SURE? appears. Move the cursor to select YES. Press the OK soft key.
from uniden regarding your base station: "This expandable base system is
compatible with Uniden handset models ELX500, TCX400, TCX440, and
TCX805. However, only the ELX500 is compatible the base system's
Bluetooth and CellLink features."
You need to reset the main base unit. Unplug the power from the back of the base. While the power is disconnected, press and hold the delete key while reconnecting the power. Wait for a long beep tone. When the display shows 88 or P, press play button one time. If you have a phone without an answering machine, disconnect the power from the back of the base, press and hold find hs button while reconnecting power.