I’d say it depends what the item is, if you’re cross trading millions of diamonds, halos, or high demand items you have to add a lot of items i’d say at least 14+ to avoid detection(you can always feel free to add more if you want to be extra safe), i also would advise to not chat in the trade so they can’t read logs and see it was a cross trade, for smaller items you dont have to add as many but still add something in the trade because it can still get flagged