LiLei 和 HanMeimei 出国后，鹦鹉Polly就不见了！综合以下线索，你能查出，Polly现在在哪里吗？
I know you're looking for Polly, and I'll be happy to tell you what I know:
It's healthy and safe now, and you can follow the clues below to find it.
1️⃣ My cousin was on holiday in my city (**h***💚) (7 letters) last month.
2️⃣ He told me that someone once sent Polly a box of melon seeds and the shipment number was: ♠︎ ♦︎ 3 ★ ♣︎ (six digits).
3️⃣ There is a correspondence between ♠︎ ♦︎ ★ ♣ (five digits ) and 💜💚💙💛 (4 letters).
4️⃣ At least three netizens claimed to have seen Polly in parks in the city: a dog, a woman in red clothing, a man in red pants. The clues to the shipment number are also hidden in their names.