Can we put this one into the "How Is That Even Possible!?" pool?

must be a yukari or remilia money

Or some kind of illusion.

It's an incident, I'm telling ya. Definitely and incident...

Reimu's dying.

Happiest incident ever.

Sakuya needs to stop Marisavfrom borrowing it all, though.

Could this be... the Zimbabwean dollar...?

Is someone laundering money through the Hakurei shrine?

I'm guessing Suika finally did something useful for the Hakurei shrine and 'gathered' money for it.

Is this...a Dream!?

BadRoad said:

Is someone laundering money through the Hakurei shrine?

Incident you say?. Also, It's has disadvantages more than advantages.

it's an incident alright

alexei said:

Could this be... the Zimbabwean dollar...?

Someone (Marisa) tried this before and she learned it the hard way...
Calling back to Morino Hon's 4Komas.

alexei said:

Could this be... the Zimbabwean dollar...?

I'm thinking the same thing XD

...the Rapture is near.

Unfortunately, it was all outside world money. Only Kourin wants those, and not that much.

I'm almost just as surprised that she still routinely checks the box.

Well, Gensokyo is a land where only things that have become myth and legend are transferred. Hence, it is clearly a denomination of money that has since been retired out of service, and is no longer legal tender.

Momijiki said:

I'm almost just as surprised that she still routinely checks the box.

She has to clean out the cobwebs occasionally.

After all the incidents that Reimu had solve, she is granted a place in the heavens, best way to get her there, making her soul leave the body with this amount of money

what happens next reee

I got a Theory about who left the money, that person was...
Kasen. Ibaraki Kasen.