if it helps: we provided all the airplanetickets that i still found, sometimes only half off the trip, but, hey it shows something right... a bunch of pics and NO passportstamps (in retrospect, i would have added those). we did have a couple of trips putting us next to each other on the plane.
we didnt get a RFE.
but i have to add some people add more evidence and do get an RFE...
the WT stamp is your entry stamp (has the date and says it expires in 90 days) and i've never heared of exitstamps in the US, maybe arriving stamps in your homecountry?? but belgium doesnt do that.
sounds like you're all good to me.
good luck.
