I cannot see any photos in that link - I would have to sign up.
But make sure you get the terms, types and names right and clear.
You speak about a Beovox 500 system; Beovox 500 was a very small 1960s speaker - doesn't make a system together with more speakers.

Anyway;

There are no less than three versions of Beovox S45;

Beovox S45 (Type 6302) and Beovox S45-2 (Type 6312) - both 1970s three-way with single-part front grill - used 4 Ohms woofers from Peerless.
Beovox S45 (type 6427, which is the newer 1980s two-way with two-part front grills) used 6,4 Ohms woofers. These speakers may not be what people usually refer to when talking about Beovox S45 and repairing/replacing woofers damaged in shipping etc.

So the answer is; YES, they are original woofers.
- But not for the Beovox S45 versions most commonly discussed.

Martin

Thanks Martin, 

They didn't seem like they'd been swapped out, but it's really hard to tell.

I'll contact my buyer, and see what sort of compromise we can come to if he's not happy.

I don't suppose anyone knows what make and model of bass speaker they are?

Thanks, Rob

The brand is unknown.
They were custom produced to B&O for use in Beovox S45 (Type 6427 only) and Beovox S55.
They won't be any good as replacements for the Peerless version used in types 6302 and 6312..

Martin

Hi Rob,

I have exactly the same speakers and am looking for the woofer exactly as you are describing as per my avatar.. If your buyer still  isnt interested I would be !

Thanks 

Neil

Hi Rob,

I have exactly the same models as you described so they are correct for the S45 (6427). I need a replacement woofer so if you’re buyer isn’t interested I would ! 

Cheers

Neil.