Just a thought. Anyone ever got anything amazing at a local currency exchange?

Was walking into work this morning and for a while the post office currency exchange has been closed. To my surprise it was open today. So I ask have any of you members ever got any interesting banknotes or coins from one? Well worth keeping?

Is it worth taking a cheeky gamble and maybe gaining something exciting, I feel there could be some exciting unc currency hiding away?

Most of the time currency exchanges only give you recent issued currency so it would be good if you want UNC or near to uncirculated notes.

Btw this is coming from times when we used to go on holiday when we bought foreign currency.