Adrian offered to sell palay grains to the NFA. He submitted the requirements and was given a quota of 2,640 cavans by noting on the application of Adrian the quota for 2,640 cavans. Later, he delivered 630 cavans of palay grains that were not re-bagged, classified, and weighed in accordance with the procurement requirements of the NFA. When Adrian demanded for payment for the 630 cavans of palay already delivered. NFA refused, saying that the 630 cavans delivered were only for purposes of offering them for sale since they werenot re-bagged, classified, and weighedin accordance with NFA's procurement requirements, hence there was no acceptance of the offer. Is there a perfected contract of sale between Adrian and the NFA and how are goods deemed accepted by the buyer as "delivered"?