I can't give you a definitive answer, but #7 indicates "other" so PET#7 would be a plastic that is PET but may have other plastics in it as well. (It's not a pure PET or it would be a #1) It may, for example, be a laminate with a thicker layer of PET and a thin layer of something else to improve its barrier properties, but the thin layer prevents it from being able to be recycled with PET. Alternatively, it may be a blend of PET and another plastic (could be PC, could be bio-resin).
I'm not sure what classifies a plastic as food safe, but #7 is a catch-all so you really can't be sure what it is.
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