I've been married 2.5 weeks now and I'm trying to get into the process of writing all the Thank Yous for our wedding gifts. The day after we did a gift opening and found there to be 4 gifts with no card or label with a name so we don't know who they came from. 1 of the 4 was shipped to our house before the wedding so it's also possible it came from a guest who couldn't attend.
I crossed off names from our seating chart to see which guests have and haven't sent us a gift to get an idea of who the unknown givers are of these gifts. Unfortunately I have more than 4 guests/couples not crossed off on my list so I can't just ask each guest/couple that I didn't cross off to claim which gift they got us. Plus I don't know if any of these guests just haven't sent a gift yet.
What is the proper etiquette for situations like this? Do I only thank those for the gifts in which I know who the giver is and leave it at that? Should I contact those I don't have a gift matched to and ask if they gave a gift and if so, what it was so I can thank them? Your input would be greatly appreciated!