Approximately EUR 8 including shipping. Still sealed (probably - if not re-sealed).
There’s definitely some more stuff in the box like a manual and driver disc that I can hear moving around. After all, the boxes are fairly large compared to what you’d get today.

I’d want to unpack them… but I also don’t because they survived so long. I don’t know. Maybe if I’ll get yet another one…

Here’s a look at the entire box:

Specs:
Bluetooth 1.2 Class 1
USB 1.1

Minimum requirements:
300MHz CPU
128MB RAM
Windows 98SE

So what about the Class 1?
Typically the devices you use are Class 2 with Tx power of up to 2.5mW and range of around 10m.
Class 1 can go up to 100mW with range of around 100m. Assuming both ends are same class. Otherwise you’re just causing more interference on 2.4GHz.
https://www.sharetechnote.com/html/Bluetooth_Specification.html#Bluetooth_Classes_and_Ranges

It also has an external antenna giving it some cool factor.