It looks like I already had 3 Golds at that point, so I think you're right. The general rule is to get 2 Golds before your first Province, correct? I just thought I'd build up one turn more because I didn't think his strategy would be that fast (is it normally or did he just have good luck?). The 3rd Envoy was indeed a late buy and I thought it would be more useful than Silver at that point.