I received two 1099-k's one from square and one from stripe. I am not self employed. where do I enter them? I sold some expensive camera lenses

I lost my job and needed to make some money to pay my bills so I sold some of my expensive camera  equipment. I received one 1099-k for $2700 and one for $1100. I am being prompted to enter these under self employment income  but i'm not self employed. I live in MA and i know these get reported to the DOR for anything above $600 so i want to make sure i include them . I'm not really sure what to do with them.