Business Covers With Correspondence

I have the following groups of business covers with correspondence:

Approximately 400 unopened cancelled, return to sender envelopes with 3 cent liberty or Thomas Jefferson stamps 1955 - 1957.

Approximately 200 opened business envelopes of the above with original correspondence inside.

Approximately 100 unopened, cancelled return to sender envelopes with 1957 postmark and 2 - 3 cent stamps. In the envelopes are 2 cent unused business postcards.

The correspondence inside the envelopes is mining related (silver) either assessment notice on their penny stocks, stockholder reports, proxy reports/response requested. The sender(s) are defunct silver penny stock mining companies. Most of the envelopes carry a return postmark from around the United States, mostly Northwestern United States. Some New York, New York return cancels are Old Chelsea Station, Wall Street, Radio City, etc.

How would you advise to sell these?

to SCF. About your question- Intact and in manageable lots.

edit:
I realize that you was just asking for some information, but just to make you aware of the forum rules, there is a post count and other criteria before you can post any sale listings in the buy/sell/trade section. So jump om in and join in the conversation! Glad to have you aboard!

Thanks for reply, gobos