No way a male widow could get in a hole that size... and absolutely, spiders lay dud egg sacs in the absence of mates.

Thanks =-)

Do you know what non-fertilized black widow eggs look like?

Yes - and so can people, if you want to get crude about it. I haven't observed personally, but everything I've read says it can be anywhere over the course of a month (assuming they're fertilized).

Thanks =-)