If you own pinballs and are worried about their value, sell them.
Why would anybody buy something like a pinball and be worried about what it is worth after you bought it. If so, you are in the wrong place.
Do you worry if your house is going up or down in value? How about that big screen TV.
You should worry about your job, as this is where the real concerns I see with this corona issue.

If you bought games you can’t afford and need to be able to sell them at the same or more money than you paid, you should sell now and sleep good at night. And next time you go buy a pinball don’t do it on credit, or with money you need to pay rent or other essentials.