Better put that into a spoiler!
I"ve found so far:
spoiler
You've found:
a DVD of The Core (2003)
a secret glade
a holographic Charizard business card
a marsh wren
a tumbleweed
a cool bug
a pretty leaf
11 squares packed into a larger square
a normal-looking leaf
an orb wren
a necklace of element samples whose symbols spell out your name
the Principality of Sealand
a rock with neat stripes
The Long Now Foundation's archive of every Animorphs book
a broken smoke machine
a friendly jumping spider
a spider-silk scarf
a block of scandium
a pair of platonic solids, not quite touching
a really cool data point
baby shoes (and baby)
a friend
two Andalites, one canonical
the Heart of the Ocean
a Rhode Island the size of an ant
a piece of pumice
Shops are still closed in Germany today. Let's see tomorrow. Nevertheless thanks for this hint.