Oh dear! You’re upset! I hadn’t realized you were so upset, or I would have said something earlier.
First, if you see any more of them, please photograph them before flushing them. A visual is always handy in identifying bugs. Just pop them into a ziploc–that will give you time to do the heeby-dance before you get out the camera.
Second, it’s not likely you’ll see any more of them. I say this because this is the first time you’ve seen ANY of them. If you’d seen them before, this wouldn’t be such a novelty. Hence, they’re not exactly a major infestation.
Third, it’s not likely that these originated from anything unfamiliar to you. If you have silverfish, then these are probably silverfish. Little bitty silverfish are floppy and have little things poking out. Little bitty roaches are not-so-floppy and run away fast, so these are probably not roachlets.
I’d much rather have silverfish than roaches.
Fourth, if these were in the sink, they got into the sink from somewhere around the sink. They did not get into the sink from, say, walking in the front door or after living for a month in your freezer. They probably didn’t get in there from dangling down from the ceiling. (Really, all this is very logical.)
I say this because you found a bunch of them in the sink. (I know, you think I’m obsessed with sinks, but bear me out.) If these guys came from ANYWHERE other than the sink, they wouldn’t have been able to get there in a big group. It’s hard to get even Boy Scouts to stay in one group . . . you can imagine how difficult it must be for baby bugs.
No, those bugs hatched very near where you found them in the sink.
There is NO REASON TO PANIC! These aren’t the Pod People. They’re just little innocent bugs.
Hence, all you have to do is . . . clean around the sink. Any crevices? They’re likely places. Another very likely place is that space behind the sink where the vent/overflow hole goes. That’s a nice, moist area just perfect for silverfish eggs and baby silverfish. Might want to pour some hot water in there.
Drag everything out of that bathroom and clean. Judiciously spritz some of that nice household 6-month bug stuff behind the cabinets. Seal up any crevices with caulk. Keep the ferrets out for a while.
Also consider sprinkling diatomaceous earth around the corners of the rooms. It’s harmless to you and your ferrets–it’s actually edible–but will do a number on the bugs–all bugs.
Now, stop worrying! These are just harmless little guys, and you probably got all of them already. Your ferrets have probably been enjoying the extra treats, anyway.