Hi Keith,

The following article in the German magazine SOKAR might be usefull:

Arnold, Dieter, "Die Pyramide Sesostris'II bei El-Lahun", in SOKAR, nr 32, 2016, 50-62.

Since Guy Brunton in 1920 the interior of the pyramid hasn't been investigated. However on 24 september 2008 Dieter Arnold and Adela Oppenheim got permission for a short visit. Oppenheim made some photo's of the interior, 6 have been published in the article.

Brunton also inverstigated tomb 621 and it has been documented relatively well.

Best regards,

Charly

www.desheret.org