Hi I have a parcel
UE837289596CN
ID18056102958877CN
The update shows at custom for almost 3 months now and the seller has left ebay but said it should be shipped. now tracking shows its expired. is it lost forever?

SAL CP398672620CN, the tracking number shows "expired" on the U.S. post website, instead of "in transit", and I'm extremely worried. I'd like to ask about several things:

1. Whom exactly should I be contacting regarding this issue? I contacted USPS, and US customs , but both respond that the parcel is not in their hand. But the 17 track website shows that the package arrived at New York on July 11. Why is there inconstancy?
2. Is this a normal delay by the look of the tracking, or does it seem like a bigger problem?
Below is what shows on 17track, but shows “expired” on usps.
Cached time: 2020-09-01 08:19:04 (GMT-05:00)
2020-07-11 16:04
纽约, 到达寄达地
2020-05-27 13:05
上海市, 已交航空公司运输
2020-05-27 02:37
上海市, 离开【国际邮件处理中心】，下一站【上海国际邮件交换站】
2020-05-26 08:51
上海市, 【国际邮件处理中心】已出口直封
2020-05-25 12:34
上海市, 到达【上海中春路处理中心】
2020-05-25 11:33
上海市, 离开【大宗青浦邮政】，下一站【上海中春路处理中心】
2020-05-25 10:58
上海市, 【大宗青浦邮政】已收寄，揽投员：汤利卫，电话：13472795657

RV526687792CN
This is the order that has to be delivered by China post to India but the tracking shows that the delivery has expired. May I know if my parcel is lost or it is on the way.
Please update as I am very much worried about my parcel status and I hope I could receive it.