Strange "jingle" from dash!

[GUMY]

Really not sure where (or even if) I should post this.
This has happened only twice (in six months of ownership)
Both times happened at the same time & place - local gym car park early morning.
Not 100% certain (can't remember the previous time) but probably dark, and raining. Lights on auto, but auto wipers deactivated (personal choice).
Phone connected via Bluetooth, but not via cable to App.

After parking up and switching off the ignition, and I think after taking the key out, there was a brief jingle from the dash area, which I can only describe as like a mobile phone notification or ring tone - although not a tone I have ever used. Definitley not coming from my phone, which was in my pocket at the time. First time I thought it must have come from a phone outside somewhere, although there were no other people / cars particularly close. Second time (this morning) it definitely seemed to come from the dash area. No lights on the dash, no indication of what it was. Only lasted a few seconds and sort of faded. Very weird.

Is my van haunted? Or does someone here have any idea of wtf it might have been?

 

[Lubrown]

Could it be an AirTag or similar left over from the previous owner - a ‘security feature’ they forgot to remove?

 

[GUMY]

Owned the van from new, so don't think so.

 

[Howzat]

Maybe a bluetooth pairing alert? Just a stab.

 

[GUMY]

Definitley not coming from my phone, which was in my pocket at the time.

Solved! Turns out it definitley was coming from my phone after all .
It was the tracker app I have installed, notifying me that the van has left the geo-fence zone. Thing is, I'd been on to Streetwize (supplier of the tracker) when I first installed it, because I couldn't get the recommended TKStar app to send me notifications at all. They suggested trying the Winnes app instead, which appears to be practically identical but has obviously been developed more. Since then, I have been receiving notifications on my phone screen, accompanied by a vibration, but never an audible alarm. So the strange jingle is in fact the audible alarm now working. When it started I have no idea, and I guess I only notice it on very short trips when I stop before it has a chance to sound; when I'm driving, it is obviously drowned out by the engine and or radio. The weird thing is, it's a notification tone unlike any other on my phone, and for some strange reason, seems to be eminating from somewhere else!
Needless to say, it's a cheap Chinese product, not recognised by insurance companies, but for the price and ease of installation etc., it gives me some peace of mind.