I found a cardboard box that I had stored in the top of the closet. Inside of it were the PG extracted NETs I made in 2014. They are 100% PG and haven't been added to any nicotine. They are just the 5 micron filtered extracts. My question is simple, would they still be safe to use?

I know that the flavor will be drastically different than it was. My concern is bacteria, mold, or spoilage of organic material that made it through the filter.

Edit To Add: Over the course of two days I drip tested each extract on an old 510 atomizer. I don't think they are salvageable. The pipe extractions are flat and one dimensional. The cigars are kind of musky and lacking any definition. They might be safe, but they would be unpleasant to taste.