Stealth Advert? ;-)
Seriously do they have your name on them? Whats the gig?
It will depend on the venue, some are pretty slack and don’t care abut resale, others are pretty hot esp after the Ed Sheran thing the other week, and don’t get me started on BTS (who?? ;-) £700 for a ticket for 13 year old kid after selling out in 5 minutes. We got 3 (at £63), but then watched them sell on stubhub for over £700 every 20 seconds when they sold out!
I know they’ve been trying to clamp down for years, but some venues are getting strict. Not just concert tickets but even theatre tickets (see Harry Potter and Cursed Child, had to show credit card that matched at least one ticket).