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From every thing Except Ram or GF Cards A workbench collection from way back, Most have fingers on both sides.
Where do these go now.

Clean gold fingers

I turned stuff like that in from older boards with gold fingers. Got no complaints.
That one board with a lot of empty space between fingers. I remove that empty board material. Only fair not to expect Board sort to buy empty space.
Also. Gold Fingers on flex circuit isn't considered Gold Finger Category. But. Goes Connector Ends.
I will add this comment. I had a bunch of small boards from Thumbwheel switches and also some gold contact rotary switches. Nice gold traces and contacts. Those were from old test equipment. Boardsort bought them as High Telecom.
My point. Sometimes its best to ask.
Here to learn like everybody else.
My evaluations are my own opinion