And we cast lots—who of us should go in unto the house of Laban. And it came to pass that the lot fell upon Laman; and Laman went in unto the house of Laban, and he talked with him as he sat in his house.
And he desired of Laban the records which were engraven upon the plates of brass, which contained the genealogy of my father.
And behold, it came to pass that Laban was angry, and thrust him out from his presence; and he would not that he should have the records. Wherefore, he said unto him: Behold thou art a robber, and I will slay thee.
But Laman fled out of his presence, and told the things which Laban had done, unto us. And we began to be exceedingly sorrowful, and my brethren were about to return unto my father in the wilderness.
1 Nephi 3:11-14 (my emphasis)
Casting lots is portrayed as an acceptable way of determining decision and even ascertaining the divine will in the scriptures (perhaps most notably in determining Judas replacement in Acts 1:26, but it can be found from the Old Testament to the Doctrine and Covenants). So we might find it surprising here, but it isn’t really.
What it got me think of, however, is that while from our perspective it certainly seems no coincidence that the lot fell upon Laman, and that Laman’s failure (and Nephi’s with the loss of their property in vv.22-26) are but the prelude to what happens in chapter four, from their perspective it may have been very disheartening. They’d made the attempt, and perhaps felt they’d secured divine guidance on the matter (and we’d probably concur), so why on earth had they failed? How could it have gone wrong? Thus all of them – including Nephi – “began to be exceedingly sorrowful”. It was difficult to see from their perspective that they might well have been rightly guided, but that this earlier failure might fit into God’s plan.