Mouse or something else?

Sorry to post this! Mouse droppings? Or something else? They're much more round than typical mouse poo!
Found inside one shoe, no where else

 

Could they be some sort of seeds ?

 

I have no idea idon't think so though. I've hoovered the room where the shoes were and found nothing anywhere else.
The shoes are new but I've worn them once and I think I'd have noticed them previously.
Given me the heebies

 

Unless the mouse has a rare personal condition, my vote goes for seeds or bat droppings. I can see at least two pairs clearly connected. They almost look like mini unripe cones of something... but no growth point to connect them to a plant if they were indeed seeds. That'd hint towards animal dropping.

Mouse droppings are bigger, smoother and a bit more elongated.

Are there any decorative plants nearby? A Christmas basket with stems with berries or similar?

Do the droppings crumble? This website says "Unlike mouse droppings, bat droppings crumble easily."


Interesting question, thanks @Snowbaby

Enlargement of the original photo to show the connection:


Googled photo of mouse droppings:

 

The shape is what confused me. It's not typical mouse poo shape. Can't be a bat, def no bats in the house.

I didn't try to crumble them.
I'm completely stumped. I've pulled apart the room the shoes were in and there's no evidence anywhere else.
I've also checked and hoovered the other 3 rooms upstairs - nothing.

There were no plants near, I don't have any indoor plants.
All I can think of is this must have been inside the shoe upon purchase but I'm so sure I would've noticed this! I've worn them once in November but not since.
So bizarre!!