Need someone to value stamp collection

Looking for someone who can value small stamp collection - several shoeboxes of first day of issue cancelled stamps on clean envelopes from the 1950's and 60's. Have tried to reach out to several people but no response. If you know of someone who can provide a valuation please let me know! TIA!

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I'm a long time stamp collector. I'm sorry to tell you that first day covers from the period you mention aren't at all valuable. In fact, almost no US stamp from after WWII is worth more than face value, and most aren't worth anything at all.