Items that have left a pharmacy in the UK cannot be replaced on the shelf in case they have been tampered with or have been exposed to infection. Even if the item is still sealed inside, the packaging may have been contaminated. the rule is made absolute so as the prevent the "judgement call" situation where one pharmacist might, in all good faith make a wrong decision causing harm to a patient.
I am surprised to hear about the wheelchair as certainly here in Hampshire, wheelchairs and other aids are refurbished and reissued. There is an issue now, I believe, with the sterilisation of stainless steel instruments as it has been discovered that MRSA attaches to stainless steel and can withstand sterilisation