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This でな is indeed the te-form of だ, followed by な, a masculine sentence-final particle.
A sentence-end で can have several different roles. Here, it may be a reason marker (i.e., explaining to someone why he has a sweet), in which case the combination of で + な roughly corresponds to "you know" in English. Or it may be a simple "continuation marker". As this ...
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"oboe ga aru you ja no", means "you seem to remember."
"no" in this phrase has no negative meaning.
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