Well I’ll be danged, they were still in the parts catalog through 2017 and the purge covers had still not been marked NLA, so you just might be in luck with original parts. I did check the 1,500 item parts list for 2019 with no luck though, so definitely need to reach out to them to find out.Found it in Aqualung parts catalog (page 34): Aqua-Lung-Spare-parts-2014.pdf
The cover looks similar to more modern ones (page 25) Aqua-Lung-Spare-parts-2014.pdf or (page 26) Aqua-Lung-Spare-parts-2014.pdf, but I agree with Jack, it should be checked with Aqualung...
I would be happy to do the legwork and make the sale, but it would be silly to pay me for shipping when you can get it faster and cheaper locally, if available.