Inherited a large collection of posted stamps

[anderjam]

A family member has given me a large collection of their postage stamps (probably a few thousand in no organized order). Mostly stamps from 1975-2015 that they tore off their business’s envelopes, that looked interesting. Mostly U.S. stamps, but some international.

Also The Harris Freedom stamp collection album with several stamps posted matching the collection guide including a stamp dating back to 1893, a few 1908-1922, several 1922-1932 and so on.

Any value here? If so, what to look for?

Just wondering if it is worth keeping space in storage for this.