I’ve been challenged to make something out of these:

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They are new, but obsolete, phone cases. There are 2 more crates. Each phone has a foam insert.

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Ideally the project will make use of these, too.

The first thought was to trim the edges. Firstly, an office guillotine was tried, secondly scissors and thirdly, a Stanley knife. The guillotine was no good. The plastic is highly flexible, rubbery, and while it cuts easily enough, I haven’t found a method to cut neat rectangles. You can see how flexible the material is in the 2 nd picture, where a pink one is screwed up, held by a rubber band.

Any ideas?