Hello Chief,
Packages through Royal Mail arrive even though they may be very late sometimes. I once received a package 5 months from the date of shipping and a few times in the vicinity of one month time.
And at other times have received packages in 6 days time (in all cases, sent through royal mail). I don't think you should press alarm bells yet.
If you have paid through PayPal, you get a 6 month protection and you can claim refund in the 3rd, 4th or 5th month and upto 6 months. If I were in n your place, I would just update the seller that I am awaiting receipt of the records. Hope it helps.