You should use item snapshot or screenshot instead of classifieds link. Seller might remove the listing after seeing this, never know.

seller is still really young to cap the sale

Where's the mini for the Little Buddy? It's four months outdated.

Other sale: Bubbling Allbrero (mini at 20) + Planets Robo Modest (mini at 22) + 2.7 keys in sweets ----- ~45 keys total

http://backpack.tf/profiles/76561198009272632#!/compare/1496102400/1496188800

http://backpack.tf/profiles/76561198044504310#!/compare/1496102400/1496188800

Mini for the Allbrero: Sold for 20 keys

http://backpack.tf/profiles/76561198015384426#!/compare/1496275200/1496361600

Mini for the Robo Modest: Smoking Chieftain (micro at 19) + 3 keys

http://backpack.tf/profiles/76561198253093948#!/compare/1491091200/1491177600

Micro for the Chieftain: Sold for a Purple Confetti Shako (18) + 1 key

http://backpack.tf/profiles/76561198050813027#!/compare/1496448000/1496534400

The Beams Little Buddy is below the 4 month limit for minis, so doesn't really require a mini.

So there are sales for 45 and 55. 50 is exactly the median (lucky you), so this is fine.