Extremely Rare 2009 (Mismatch Jade/Malachite) (4 '09 rares) + 2019 Store Lion (Green Meadow Lioness) (1 '09 rare) + 2019 Store Sloth (Pale-Throated Three-Toed Sloth) (1 '09 rare)
= 6 '09 rares
for
'09 Scarf (1 '09 rare) + Easter Lil Monster (1 '10 rare) + Waffle (1 '10 extremely uncommon) + Piranha Teeth (1 '09 extremely uncommon (personally valued it lower than the other costume parts because it was just the teeth)) + Nick's Birthday Cake (1 '10 extremely uncommon) + Chinese Lantern (1 '10 very uncommon) + Horsehair Wig (1 '09 rare) + Slanted Eyes; Blue-Green (1.5 '09 rare (aka 1 rare + 1 extremely uncommon)) + Angel Costume (1 '10 rare) + Random newer items (insignificant)
= about 6 '09 rares, mattering on whether you use 2:1 between rarities and years
https://www.chickensmoothie.com/trades/viewtrade.php?id=109275322&userid=829208&signature=IEBXsjIPUq13Jv33QG6-3g