Bill was at work when Jamie's message arrived, deep in the work that allowed him at least some distraction from his life. When getting the message, his face paled, but he knew he couldn't just go to Hogwarts. There were other things that would be needed. Grabbing papers from his files - spells, security arrangements, things that could be used at Hogwarts - he made magical copies and stuffed them into a large bag. With a spell the bag would fit more than enough, and with another spell the copied papers were hidden. He banished the originals back to their places.
Next step was Apparating to the ground floor. With a casual air he passed the queue, getting the first cart after a word with the Goblin, then it bore off down into the tunnels below and his vault. He emptied the entire contents into the bag, and when it got too heavy, he conjured up one more and filled that too. He hesitated for a moment, but without the key he couldn't get into the other vaults of the family. This would have to be enough. With the bags in hand, he got back into the cart and sat still while it returned. The bags were almost too heavy to lift, but he heaved them out when he left the cart, went back towards his office before Apparating straight to his house. The Goblins would wonder, but not for long.
He called out for mum, but there was no answer. Perhaps she had already gone? He didn't have time to find out, he'd taken long enough at the bank. A third bag and he grabbing anything that might be useful before finally taking his broom and Apparating to Hogwarts. By now only the levitating spells on the bags made them possible to carry and he knew he was reduced to walking to the school if he was going to get them there at all.