Andy, you cannot bin the holes.
Alan, how many holes, what size, and is there any damage or deformation around the holes.

Colin

No, but I'm very good at digging them, in more than one sense.

Colin

Alan,
you are not going to be able to hide the holes so it will be a job of neatly filling them.
How about buying some stainless steel round head machine screws and filing the head down until the screwdriver recess has gone. You could them set these into the holes with some mastic.
Alternatively some aluminium snap, mushroom or flat head rivets could be neater. These are more difficult to come across and are still usually imperial in size so you would need to drill the holes out a little larger before bedding them in on mastic.
Best to avoid silicon as the acetic acid in it can react with the aluminium.

Colin

I'd leave it there Alan and hang a towel on it

Preferably, a peshtemal one so that we can find out what they're like

Randa

You sound like a wise man to me. Where are the other two hiding.

Colin

Melchior has gone looking for his cat and Gaspar has popped out for a drag.

Randa