Shopify + Klaviyo Abandoned Cart Flow for Unique Inventory — How to Prevent Emails for Sold-Out Items?

Hi everyone,

We're a luxury resale business running on Shopify + Klaviyo, where almost every SKU has an inventory quantity of 1 (one-of-a-kind inventory).

We're currently setting up our Abandoned Cart and Abandoned Checkout flows in Klaviyo and have run into an issue:

Example scenario:

1. Customer A adds a Chanel bag to cart.
2. Customer A leaves without purchasing.
3. Before our abandoned cart email is sent (e.g. after a 1-2 hour delay), Customer B purchases the bag.
4. Customer A then receives an abandoned cart email for an item that is already sold out.

We've explored:

• Trigger splits
• Flow filters
• Added to Cart event properties

However, our Shopify integration does not expose any inventory-related attributes such as:

• Inventory Quantity
• Available for Sale
• Variant Availability
• Product Availability

Questions:

1. Is there any native Klaviyo method to suppress abandoned cart emails if the associated product is already sold out?
2. Has anyone solved this using Shopify tags, metafields, custom properties or catalog sync?
3. For businesses with unique inventory (luxury resale, vintage, collectibles, art, etc.), what is considered best practice here?