Man, I usually like to give people the benefit of the doubt.
In fact, without having seen the footage I wouldn't have been able to make an informed judgment so perhaps would have given her the benefit of the doubt or most like not have cared enough either way.
But, in this instance I have seen the posts, the footage and now her explanation.
I don't think you need to be particularly smart to crack this one, to be honest..
Clearly they intentionally stole the box. She actually sent him back to take it, if you watch the footage. She got caught out badly.
They didn't expect the backlash, otherwise stealing a random box wouldn't have been worth the risk. That's point number one.
Point number two is, the thing went doubly wrong because of what was in the box. I would accept that she didn't know what was in the box at the point of the theft. I've little doubt they checked quickly afterwards, so I also don't believe her story about not having done.
Deleting /blocking the lady for me underlines the deceit even further.
It was a petty theft that backfired considerably. A real shitty move. I don't think she was out to steal medical supplies but that was the result.
She and her bf can lie all they wish. They stole when they thought noone was looking. You are either a thief or you are not. Alot more people are than you think, most don't even realise they are until they get the chance to.
Finally, you can tell Ariel is thinking similar to the above.