The same thing happened to us yesterday and we did what the others said and just scored down alittle but more on one side and it fit. Coro drives me mad sometimes too lol
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Keep it you can use the coroplast for other things. Litter boxes, kitchen areas, hay racks, hide outs for the pigs. ect.
I won't just take off an inch. To make sure it fits this time, measure how much it extends out, then score it about 1/2 inch extra. For example, if you measure that it extends 2 inches passed your grids, score it at 2.5 inches, just to be safe.