There's a patent application close to issuance for an invention we have lots of significant pieces of prior art for, but the time allowed for third party submissions under 35 U.S.C. 122(e) has passed.

MPEP 2202 and 2204 seem to say anyone can submit prior art at anytime, but is this only for already issued patents?

Another option seems to be sending the prior art to those filing the patent, as they are under a duty to disclose.

Are there any other alternatives/options? Thanks so much.