Used Stamps

I have a few dozen or more stamps from in-laws collection.the majority have been peeled or steamed(?) from sent mail. Should I research them or would they be of little value to collectors?
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I have a few dozen or more stamps from in-laws collection.the majority have been peeled or steamed(?) from sent mail. Should I research them or would they be of little value to collectors?
Answers
Probably of little value, unless they are very old.
I'd say most are dated from the 40s and 50s
Sadly no value.