I second the suggestion of calling the CS. I find them very helpful and hopefully you will get directed to a store which has your preferred combo in stock and you can take it from there! Good luck!
I have just bought my first herbag last week. I wanted a black/navy combo. Where I am , we have been in lockdown for a while so back in December I emailed the lovely SA who helped me when I last visited my local store in the autumn. They didn’t have anything suitable in stock back then but two weeks ago I received a message that a bag meeting my requirements was available and whether I was interested in seeing some pictures. Long story short, the bag arrived last week and I couldn’t be more pleased with the whole experience.
Congrats! Per the video I linked above, it seems that a newer version of the Herbag comes in attachable straps. Does your's come with the straps or an attachable one?