While i took the bumpers off I found this attached on the left inner side of the front bumper with the spare key inside.

I have seen a pic of this in the 280z car parts manual. Cannot find it at this time. If someone has it can you post the link to it?

Thanks.

Let's see the key.  Seems odd that the bag wouldn't have the word Nissan on it.  The tool bag does.

There was a similar post a while back where somebody found a magnetic key box attached to his car and thought it was "factory".  Hard to imagine Nissan supplying a device to store an external key on a car.  Every thief would know "it's here somewhere!".

The YKK seems right though.

https://en.wikipedia.org/wiki/YKK

 

There's a tool bag in Miscellaneous.

https://www.carpartsmanual.com/datsun/Z-1969-1978/miscellaneous

OK I think this is what I was referring to the B - Key Holder: https://www.carpartsmanual.com/datsun/Z-1969-1978/miscellaneous/cylinder-lock-key

 

Seems like it is the eBay item number:193947445721 and not the crap I found

8 hours ago, MH77280Z said:

OK I think this is what I was referring to the B - Key Holder: https://www.carpartsmanual.com/datsun/Z-1969-1978/miscellaneous/cylinder-lock-key

 

That's just a keychain, that style was popular back in the day.  Here's one of that style for sale with multiple pictures:  https://www.jjshouse.com/groomsmen-gifts-personalized-elegant-vintage-leather-keychain-sold-in-a-single-piece-258288090-g288090?country=US

Nice little bag, but I doubt seriously that it is "original equipment".  It is certainly not the key holder described in the parts manual.