This is good to know, Andry... but unfortunately is not enough.
Please ALWAYS contact the Customer Support services (either by using the CONTACT US form on the help page or by phone call, if possible) if and when the gift doesn't arrive in an appropriate timeframe.
If they don't know on time that the gift hasn't been received, no action could take place to correct this situation. And while talking among ourselves or polling the issue on the Zoo could be good, it may not be enough or, in the end, strictly useful: if this doesn't reach the appropriate instance this issue can't be solve