Steam wallet question

so my friend gave me a bunch of codes as a gift for me . i redeemed them . i already have a steam wallet . i found out that if the keys were fraud by the seller they can be revoked by steam. if they do return it . and i already bought games with the money will it remove the money from my wallet or return the games ?

(lets say my wallet was already 100 and with the codes redeemed its 150 and i bought games for 40 for example)