Can Borden none such condensed mincemeat be used past its shelf life?

Answer 1

This is from the Eagle None Such website. None SuchMincemeat Ready-To-Use version has a 48-month shelf life from its production date. Our condensed version has a 36-month shelf life from its production date. Once opened, you must refrigerate and use within 3 to 4 days.

Answer 2

As long as the jar is still vacuum sealed, the issue with this product will probably be quality factors such as flavor and texture, not food safety. And it depends how far past the recommended "best by" date it has gone.

If you want to serve it to company, I'd suggest you get a new jar.