Ace's thought would be mine. Do you rent? Is your landlord doing some work that you don't know about? Has he had a contractor in? Does a buddy with a mind to pranks have a key? Anyone have a key? I'd be tempted to think that someone's playing with you a bit.
A quick google search shows that Hilex is likely Hilex Poly, a Japanese company that makes plastic bags, and that "quikmate-ez" is a type of bag that they make.
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