Topcashback 'free' chocolates

Topcashback/Snap & Save is giving £3 back on any box of chocolate. 20,000 claims when the offer will be removed from site. I spent approx. £2.80 in Costa coffee buying a Shopmium offer - the chocolate 'Kind' bar - & some small lindt chocs. I received £3 from Topcashback & £1.35 from Shopmium. It may be possible to send in a receipt for a small bar of chocolate and get £3 cashback but I don't know

''Offer valid 25.03.2019 10:00 – 31.03.2019 23:59 or until redemption limit of 20,000 is reached. If the redemption limit is reached, the offer will be removed from the site, while the offer is shown on the site, members may still redeem this offer. The receipt must be submitted within 48 hours of the offer end date.''

https://www.topcashback.co.uk

https://www.shopmium.com/uk