They do accept that amount of cash. They do a dance where they take your cash, convert it to Apple gift cards at about $1k (or $2k?) each, then they apply those

They do accept that amount of cash. They do a dance where they take your cash, convert it to Apple gift cards at about $1k (or $2k?) each, then they apply those gift cards towards your purchase. Afterwards, they throw away the gift cards.