The outside puncture picture looks like it was done with a round rod or stick because of the stretching. once the whole was made they cut the inside plastic with a knife. Someone was in there cause it looks like that pine bail was ripped to see just what was inside. Do you live in a neighborhood? any stupid kids about? any family's kids or such? To me it doesn't look like an animal.. In fact I dont see how it could be with an stretched puncture whole on the outside like that and a cut inner plastic( it wasn't ripped or streched thats how i know it was cut) it appears the culprit was human. Why they poked a whole then cut the inside is kinda funky... stay safe! and I hope what ever did this doesn't come back!