Gently used cassettes

I have many gently used cassettes.
Most are "metal" bias including TDKs which have Magnesium
housings. These are buried in my archives and will likely never be used again in this lifetime (Unless I can find a NOS Onkyo TA-2090).
Given the trouble it would take to find, sort and count any saleable units,
amuse me with an offer I can't refuse...

Hi Phasecorrect,

I have:
3 (type II) TDK SA-90's,
4 (type IV) TDK MA-110's
and two 5-packs of (type II) TDK XLII-90's,

All purchased sometime between 1993 and about 2000 or so...all in their original shrink wrap and never opened. They were always stored in my dad's audio media cabinet in his system room, never in an attic, basement. Make an offer, I'm easy.

How would you know that they were recorded once? Ebay has listings for over 5000 cassettes new. Why bother with used cassettes when new ones are so cheap?

Good deal Ivan and +1 Yogiboy.

Correction - the 5-packs are not TDK, I meant to say Maxell.