Not a bad price. Especially for decent games worth playing. I remember playing Time Soldiers quite a bit back in the day.
www.crazykong.com has the manual for the EFPRM kit. To enter the test mode it says:
"turn on one of the two self-test switches. One switch is on the audio PCB, the other switch is on the edge of the game PCB. Free play is among the "Bonus Adder" options in the Coin Options.
The manual for Time Soldiers is there too.
Both games I believe are technically JAMMA, so swapping games out in the cabinets is an option. The biggest hurdle is that you also managed to get two games that use unusual joysticks. I think the rotary sticks in Time Soldiers will work with standard JAMMA, but the vertical monitor might be limiting. The Hall Effect joysticks on EFPRM pretty much make that one impossible to swap games easily.
I'd guess that EFPRM is in either a Sega convert-a-cab (like Frogger) or one of the many bootleg cabinets that were based on that design. The way the monitor is mounted (upright instead of leaning back) is the same as the bootleg cab that I made into my MAME cab. But then again, you should never underestimate the changes that operators made in the process of conversions. I'm guessing the other one is a Taito cab

. The KLOV pic of Stratovox seems to be pretty much identical, but Taito used these for most games from that time period.