the 打包 that never was

Went to engin canteen to have lunch at 1pm.
Ordered lemon chicken rice.
Uncle gave me lemon chicken rice.
in a microwave box...
and charge me extra 10 cents...
I was too shocked to say a thing.
Obediently went back to my table with the box.
Obediently ate my lemon chicken rice from the box.
Obediently looked like an idiot eating in the canteen from the box.
And obediently returned the box to the utensils return point.

So, do they assume that you want it take-away if you don't voice out? For a moment I thought it was 1pm and the stall ran out of plates... (still, illogical to charge extra 10 cents if they are the ones who ran out of plates)

Now I feel like microwaving that uncle.