I enshrouded 60 Boots
Was trying to get a Ralakesh with +1 frenzy, so I enshrouded 60 Darkray Vectors.
I know its not the biggest sample size but I ran out of gold ( seems like buying a bunch of uniques will drain your gold pretty fast) and got bored.
All boots were cooked to level 3/3 to increase the chances of rarer varieties.
Results: Didnt find a single Tier 1 Boot.
3x TIER 2 Boots found ( 2x Beacon of Madness, 1x Seven League Step)
57/60 were T3 or below ( didnt kept track of those , but all prettty common)
Conclusion: If you are trying to enshroud a t2 unique, it may take some time/patience, but you'll get it eventually, if you are trying to get t1 though... Good luck.