not to bash you, or your friend as i know you're doing him a favor, but he may get some luck if these are lowered in price. you'll get a lot of views since these are LCI tails, highly wanted, but you can find these brand new on ebay for about $100 more. no issues.
for $100 less, you'd get these but have to diagnose the issue, and get replacement parts if needed. just letting you and your friend know what they go for brand new and maybe he'll get better luck. good luck!
facebook.com/jmeasphotography | jmeas.4ormat.com | IG: jmeasphotography