Im gonna give you my advice based on similar situations i've had with boas who associate feeding with opening their enclosure... Get a cloth or a small towel or whatever you have similar to this and when you open the tub/terrarium or whatever... just cover the boas head with the piece of cloth and pick her up.... I have a year old salmon male that wasnt handled by its previous owner and only was opened to get fed.... so it took a couple of weeks of doing the "cloth thing" to get it to know it wasnt always feeding time... Another option is feeding in a separate tub so they wont associate feeding with you opening their cage..! good luck and hope i have been helpful!