I found a community of 20+ white-brown bugs ~2 mm long, isolated to one interior windowsill on 3rd story in Brooklyn. The window is closed tight. I caught as many as I could in a small cup (~1" wide for scale) and windexed the sill.
Assuming they are harmless but just not used to finding that many bugs congregated in one place indoors. Let me know if any positive id, thanks!