Since you were married to the guy when he legally bought the guns, then transferring them to you is not a problem with the Washington States firearm transfer laws.
Legal Green card holders can own firearms as long as you aren't a felon or otherwise restricted from possession.
Here's an excerpt from Initiative Measure No. 594
Some transfers between non-licensed sellers and buyers are exempt from the background check requirement including:
Bona fide gift transfers between spouses, domestic partners, parents, children, siblings, grandparents, grandchildren, nieces, nephews, first cousins, aunts, and uncles.
Legal Green card holders can own firearms as long as you aren't a felon or otherwise restricted from possession.
Here's an excerpt from Initiative Measure No. 594
Some transfers between non-licensed sellers and buyers are exempt from the background check requirement including:
Bona fide gift transfers between spouses, domestic partners, parents, children, siblings, grandparents, grandchildren, nieces, nephews, first cousins, aunts, and uncles.