That's only a weird experience because it's your first time doing that. Now, back when I was still mining Bitcoin, before the gold rush happened and everyone wanted to do it, I was making weekly trips to the bank also, trying to cash in my freshly-mined Bitcoins for cash (I am a holder but hey I need to pay my bills too, right?).

Here's a picture of me finding my very first Bitcoins, I got so lucky!
<a href="https://ibb.co/wsnM6nT"><img src="https://i.ibb.co/wsnM6nT/image.png" alt="image" border="0"></a>

In fact, upon closer inspection, the coins you had looked almost like the ones I mined. I was a sole customer at the bank, perhaps we're customers at the same bank?