" In general , both are correct. But for your example, "of " has a better semantic connection to my ear.
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MustAsk" I'm going to save this receipt as (a) proof of purchase (for/of) my new computer."In general , both are correct. But for your example, "of " has a better semantic connection to my ear.
MustAskthank you for your reply, but what about the indefinite article ?No need to insert the indefinite article.