Okay I am posting this under the vague title of navigating inside IKEA but it has nothing to do with that.
Someone I know

happened to be in Germany and thought ah these carpets would do just fine at home. Being a good and honest person they knew they would want to take them over the border into Switzerland and declare them so they could get that nasty 16% MwSt (VAT) back. They asked if they do the nice green pieces of paper that would allow them to take the carpets into Switzerland. Despite being in the middle of Germany (Frankfurt) they had no problem in providing the necessary paperwork and parted company with their €600 and drove down over the border into CH.
As there were three in the car there was no problem bringing the goods in and the nice Germans stamped my papers so that they could claim the VAT back. Of course when they got home and laid the carpets out they were astounded to find that they did not actually match their furnishings and would need to be returned. Shit!!! After scratching heads they thought okay lets try and take them back to Dietikon which is only 10 minutes drive instead of 3 hours. They gave them to the nice woman in Customer Information and told her they had lost the receipt and asked if they could give them back. She saw this as no problem at all, but said I can't give you cash back just a card loaded with money which you can spend in the store. Um okay well the alternative was worse and they wanted the carpets anyway... To their surprise the total cost of the carpets was actually CHF 1200 in CH... And the 16% VAT was still due - another CHF 150.
So they wandered off bought the carpets in Dietikon in the right colour, kept the receipt, took them to Dietlikon a couple of days later and got their money ie cash back... They then bought the carpets next time they were in Frankfurt, the right colour this time and pocketed the money which was around CHF 500.
So if ever you buy something from IKEA in Germany and want to give it back in CH it is not a problem and you will come out on top
I am not quite sure what the moral of the story is. Just if you need to buy something expensive which is transportable it is probably cheaper in the German IKEA, you get the VAT back and you can still give it back in CH if you dont like it...
Richard