Missing Slot Holes on a Fabricated Board

I received a DKRed order of boards only to find that the slot holes were not drilled - pads are present but no holes in them. The holes appeared in the preview before ordering, leading me to believe that the files were all good. How should these be specified so that they are drilled in the fabricated boards?
Other topics on the forum seem to indicate that the slot holes may not be supported, but I did not find any particular documentation for board house capabilities to specifically indicate that.

I’d suggest taking this up with Digi-key directly.

Hello @SmartSense,

Sorry your boards came in incorrect. I have private messaged you so we can take care of this in a private setting.