I'm going with them. Get really close. Those pock-marks are indicative of predatory feasting. If you do not see a single bug, get back to us.
Also, what are your Temps and RH? Looks a bit hot in there. I would definitely get powerful fan on them and find a way to scrub the hot air outside. Drop the humidity a bit too, if you can.
And, I see you have some towels/clothes draped under the buckets. Use a plastic drain tray if you need to, but towels/carpet/fibers can be massive breeding grounds for pests when moist.