HELP! I'm sure you've heard it all before, but here goes ...

Sometime, a long time ago, I was paid in crypto-currency and specifically remember using some of this currency to purchase Pizza Hut, UK.

Now skip forward a few more than a few years and it it's occurred to me that whatever is left could be quite substantial today, but I don't know how, where, what to do in order to find it?

Am I a millionaire? Will I ever know? Help me!

(Honestly not expecting much in terms of a resolution, but appreciate any helpful advice if there a possibility!)