Generally, unless it's been *years*, you should normally be fine - the sterilization process is quite effective. Also, the membrane itself still works, so in a *worst* case, do a wipe down of the coupler/fill are with ipa 70%, filter some product through, collect, and return to the filter, that way the underside of the filter membrane has been washed out by material that has passed *through* the filter (if it's a 0.2/0.22 micron, that liquid will be sterile)
All the people I dealt with in the past that sold irradiated plastic lab ware in sealed packages said they had to put an expiry (because sterile) but after a while they stop testing to see if still sterile, and they nearly never came across something that wasn't sterile until a *long* time past the expiry (*multiples* of the shelf life, usually). As much as the expiry is there for quality issues, they know all to well that if they actually put the true shelf-life, nobody would likely have to discard and restock, so sales would go down...
If the barrier packaging is of any quality at all, it could *conceivably* stay sterile forever.
Doctor9