Oh ganb8te! "kind regards"????? ugh. I would want to punch him in the face!
It's difficult at this point knowing how to be less business and more fun since things between you are so distant.
The only thing I can think of is to reply and say something like "you can collect your items when you like, perhaps we can have lunch/dinner/drinks and catch up sometime soon!"
I find when my H sends a super cold business-like text if I reply with a friendly tone and using some exclamations he sometimes starts being more lively. But I get where you are coming from, why should you be all "Hey! How are you? Yipee!" when he is cold or non-communicative? I just find being really friendly seems to thaw the ice sometimes. It usually goes against how I actually feel (full of sadness, hate, and despair haha) but it seems to work for me better than being cold.
