u/Key-Midnight-70

Hi, I recently purchased a vintage calculator user manual from a seller in Eastern US. I am in the UK and the seller dispatched the item using EIS. The book is due to be delivered this week, but the tracking info shows that it is likely to be delayed. The seller dispatched the item on the 21st April and the last tracking info, dated 25 April, shows that it is still ‘In Transit to Next Facility’ and has not yet arrived at the International Hub.
Could it be that the item has arrived at the Hub and has not yet been processed, or is tracking info slow to update? I was planning to chase it up with the seller if I don’t receive the package this week. Or should I contact eBay directly?