Mount adoption license - what when have them all?

Hello so Ive bought mount adoption license for all types regular, istani and few others not at once of course but by few from time to time. also sometime only one of them sometime in pack of five, at the end I have all mounts skins unlocked and still have some licenses in inventory but no mounts skin to unlock. So the question is, is there anything I can do with spare mount adoption license item or just keep them in my bank as a suvenire ?

There is nothing you can do with extra licences. They have no other use and Anet have said they won't add new mounts to the existing licences, instead they'll bring out new licences over time.

You could contact Support and ask to have the extra licences refunded, or just keep them if you want.

I'm with @Danikat.8537: file a support ticket and ask. The worst thing that happens is that they tell you it's just a souvenir. The best thing: they might refund some of the gem costs.