Oyster visitor card question

Soldato
Joined
27 Apr 2007
Posts
3,348
Last week of November I was in London and had an Oyster visitor card with £20 loaded on, I never used the card (left it in my baggage so bought a day ticket for the day we were travelling into the city). Never had to use one before and am mainly in the midlands for work etc and not likely to be in London any time again soon.
I guess I am just wondering if it is ok to sell it (in general)?
 
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