I have some very small (2-3mm) black beetles in my house. I think they are beetles because I have had a look at one under a microscope & it had 6 legs & looked beetle-ish! Sadly the microscope didn't have the facility to take a picture. I tried to get a normal camera photo but they are so small it didn't work well.
They have small heads, larger bodies & look like elongated full stops to the naked eye. Under the microscope I could see what look like vestigial wings on its back & some good big mouthparts but not long & sticking out like on a weevil.
I found them first in a cardboard box where they were to be hiding under the flaps, they seem to be photophobic. I then found some in my kitchen dresser in some wicker or seagrass table mats. I found more in the living room under a teeny cardboard box. I have just found some in a kitchen cupboard inside a ceramic dish. I haven't seen any in the food cupboards. It's possible they came in on something from the garage.
I have looked online but can't seem to find anything like them. I live in rural Devon. Can anybody please give me any idea what they are?