Flat bug

6201 found this on a package I had received this afternoon. Bug was fairly flat. Didn’t fly off when I knocked it off. From Concord US.

Number 6201 – This is a flat bug (Hemiptera/Heteroptera: Aradidae); it looks like Aradus quadrilineatus, a species associated with beech, elm, oak, and poplar trees. Very little appears known about its life history, it may feed on fungi associated with the trees where it has been found.