treating leather before long time storage?

[shiny]

Hi guy's.... For ages I have two square meters of expensive leather laying around. I made a 3 sheats and a strop out of it. The rest is just getting old. Ten years now. Still I am going to use it for many future sheats. I don't know the name of this kind of leather. This leather is tanned from both sides, but not al the way through. This makes it extremely stiff and though. You really need to wt this leather before folding it into a sheath or it will crack/break.

It had a tiny bit of mold on it. I cleaned it with water and soda. Because of this there are some dark stripes visible from the wiping with a cloth. It looks just as if it is still wet. Mainly the rougher side looks like that.

Can/should I do something about it? I reckon dark stripes will dissapear when I apply beeswax to a sheat made from this leather?

Since I am storing this leather for such a long time will it be a good idear to use some sort of conditioner for the leather to prevent drying out?

Thanks in advance!