Killing Floor - Guest Pass

I tried. They're untradable.
I also tried to friend the bot to send it as a gift. The bot unfriends me right away so it was tricky. But you can do it with quick fingers. But the bot needs to activate it. which clearly won't happen and it's still in my inventory.

Some items mention an expiration date, these don't. That's worrying.

I hope so. But these don't mention an expiration date like other items.

I have a couple sitting in my inventory, pretty sure they have been there for more than a few months.