Wedding gift to in-laws too cheap?

Long story short , my partner had a family members wedding.
due to them being wealthy , my boyfriend insisted we only give $50 to the wishing will. We are on a tight budget as we just bought a house.
the wedding was soo fancy and would have cost a fortune , and now I am regretting giving such a small amount ! To top it off ,
our card didn’t have an envelope , so I felt our contrinution was just plain cheap and Terrible.
What can I do to make up for this :
1. Leave it and don’t bring attention to it
2. try to make an excuse to give (ie. say we forgot the cash)
3. apologise for the card and small amount and thank them for the amazing day.

other ideas?
Wedding gift to in-laws too cheap?
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