Returning Macbook Pro bought at apple store

Apple has very flexible return policy.
I bought MacBook Pro 2018 with 512GB storage, but thought I'd want 16 gigs of RAM instead of default 8. I returned and got full refund, no questions asked.

The beats solo 3, that came for free with the mac, was without the box, they just took it as it is and did full refund.
It may depend on the condition and not applicable to all cases, but until 14 days after purchase you can expect full refund.

One point to note is, if you buy from apple stores you have to return to one of their stores, whereas if you buy from you can either ship it or bring to stores.
I should have bought online (I had to go to reading just for this..)