Sounds like the wedding was bittersweet. The last wedding H & I went to I just cried and cried during the ceremony, and the toasts and half the reception until I got intoxicated at the open bar to drown my sorrows. It represented to me all that we had dreamed of and it was so apparent that we were so far from that place. Still hoping to find our way back.
I think you should still write your letter this year. I don't know about the reading them out loud or reviewing past years but def don't skip it. This is something that was important to you both and still important to you now. I like H's idea about just placing it in the box. No pressure. See what happens. I am sure she has not forgotten and will be surprised to find it already in there if she pulls it out for the anniversary. If she mentions it to you, good opening for discussion. You didn't want to put any pressure on her, give her space...you know the drill well enough by now.
Did you two make any plans together for the anniversary?
Me: 30 EX-H: 37 DD: 5 Separated 6/07. MC for months, EX-H quit MC. Divorce Final 8/14/08. Trying to move on with new life.