Cant sell my dumpster diving finds

probably because people don't want to buy junk.

Some of the stuff was never used though

Are there any resale shops in the area? Perhaps you could put it on consignment with them.

Savers count? Will they give me a percentage of the sale?

I have had experience with a few resale businesses that allowed me to put my stuff with theirs. They took a percentage and gave me the rest.

Sometimes things don't sell well if the prices are too low. I'm not exactly sure why but sometimes slightly higher prices work better.

i.e. something worth $10 might sell at $4 but not sell at $2

try different prices on different sites and compare the results

Savers is not a resale site. It is a rebranded Value Village that primarily sells donated items. Google consignment shops in your area.

For a lot of odd lot stuff, a swap meet, sidewalk, or yard sale may be a good way to sell your stuff. People, passerbys, will like to see the items for sale in front of their eyes.